BPS - 5th Ed. Chapter 2 4 Median ( M ) ◆ A resistant measure of the data’s center ◆ At least half of the ordered values are less than or equal to the median value ◆ At least half of the ordered values are greater than or equal to the median value ◆ If n is odd , the median is the middle ordered value ◆ If n is even , the median is the average of the two middle ordered values

BPS - 5th Ed. Chapter 2 7 ◆ The mean and median of data from a symmetric distribution should be close together. The actual (true) mean and median of a symmetric distribution are exactly the same. ◆ In a skewed distribution, the mean is farther out in the long tail than is the median [the mean is ‘pulled’ in the direction of the possible outlier(s)].

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